Ответ здесь, Rest API - NullPointerException in Broadleaf Commerce
Для полей у вас есть упоминания, добавить выше записей в базе данных,
INSERT INTO BLC_FIELD (FIELD_ID, ENTITY_TYPE, PROPERTY_NAME, ABBREVIATION, SEARCHABLE, FACET_FIELD_TYPE) VALUES (1, 'PRODUCT', 'manufacturer', 'mfg', TRUE, 's');
INSERT INTO BLC_FIELD (FIELD_ID, ENTITY_TYPE, PROPERTY_NAME, ABBREVIATION, SEARCHABLE, TRANSLATABLE, FACET_FIELD_TYPE) VALUES (2, 'PRODUCT', 'defaultSku.name', 'name', TRUE, TRUE, 's');
INSERT INTO BLC_FIELD (FIELD_ID, ENTITY_TYPE, PROPERTY_NAME, ABBREVIATION, SEARCHABLE, FACET_FIELD_TYPE) VALUES (3, 'PRODUCT', 'model', 'model', TRUE, 's');
INSERT INTO BLC_FIELD (FIELD_ID, ENTITY_TYPE, PROPERTY_NAME, ABBREVIATION, SEARCHABLE, TRANSLATABLE) VALUES (4, 'PRODUCT', 'defaultSku.longDescription', 'ldesc', TRUE, TRUE);
INSERT INTO BLC_FIELD (FIELD_ID, ENTITY_TYPE, PROPERTY_NAME, ABBREVIATION, SEARCHABLE, FACET_FIELD_TYPE) VALUES (5, 'PRODUCT', 'defaultCategory.name', 'categoryName', TRUE, 's');
INSERT INTO BLC_FIELD_SEARCH_TYPES (FIELD_ID, SEARCHABLE_FIELD_TYPE) VALUES (1, 't');
INSERT INTO BLC_FIELD_SEARCH_TYPES (FIELD_ID, SEARCHABLE_FIELD_TYPE) VALUES (2, 't');
INSERT INTO BLC_FIELD_SEARCH_TYPES (FIELD_ID, SEARCHABLE_FIELD_TYPE) VALUES (3, 't');
INSERT INTO BLC_FIELD_SEARCH_TYPES (FIELD_ID, SEARCHABLE_FIELD_TYPE) VALUES (4, 't');
INSERT INTO BLC_FIELD_SEARCH_TYPES (FIELD_ID, SEARCHABLE_FIELD_TYPE) VALUES (5, 't');
INSERT INTO BLC_SEARCH_FACET (SEARCH_FACET_ID, FIELD_ID, LABEL, SHOW_ON_SEARCH, MULTISELECT, SEARCH_DISPLAY_PRIORITY) VALUES (1, 1, 'Manufacturer', FALSE, TRUE, 0);
INSERT INTO BLC_SEARCH_FACET (SEARCH_FACET_ID, FIELD_ID, LABEL, SHOW_ON_SEARCH, MULTISELECT, SEARCH_DISPLAY_PRIORITY) VALUES (2, 5, 'categoryName', FALSE, TRUE, 0);